Journal of the Korean Institute of Telematics and Electronics A (전자공학회논문지A)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Study on the Measurement Error Induced by Air Gap of Electromagnetic Wave Absorber in the Coaxial Line Method

동축선법을 이용한 전파흡수체 특성 측정시 Air Gap에 의한 오차에 대한 연구

  • 김경용 (한국과학기술연구원 세라믹스 연구단) ;
  • 김왕섭 (고려대학교 재료공학과) ;
  • 주윤돈 (동서산업) ;
  • 김병호 (고려대학교 재료공학과)
  • Published : 1991.11.01
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Abstract

The effect of air gap between specimen and jig on the material constant (permittivity, permeability) and attenuation characteristics of electromagnetic wave absorbers in the coaxial line method was investigated. The presence of a air gap made both permittivity and permeability measured lower than true value, and the tendency was greater in the case of permittivity. An inner gap compared to an outer gop was found to yield a larger difference between measured and true values. The effect of air gap was measured for a Ni0.3Zn0.7Fe2O4, with the gap eliminated by metallizing with Ag-paste. The measured characteristics were in good agreement with corrected values by calculation.

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